Epidemiologic Estimate of the Proportion of Fatalities Related to Occupational Factors in Finland
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1 Epidemiologic Estimate of the Proportion of Fatalities Related to Occupational Factors in Finland Markku Nurminen & Antti Karjalainen Finnish Institute of Occupational Health Helsinki, Finland In consultation with 33 FIOH and international experts 1
2 Well-established risk factors of work-related diseases Risk factor(s) asbestos, radon, quartz, chromium, cadmium, diesel engine exhaust, workplace tobacco smoke asbestos aflatoxin (mold poison) chromium and its compounds dusty workplaces, nickel, chromium (welding fumes) various dusts, solvents and other sensitizers Disease lung cancer mesothelioma liver cancer cancer of nasal sinuses chronic obstructive pulmonary disease asthma 2
3 Emerging exposure-disease relations Risk factors shift work (work strain) environmental tobacco smoke Circulatory diseases ischemic heart disease (e.g. myocardial infaction) cerebrovascular disease (e.g. stroke) In the US, circulatory diseases are the most common caus e of death, which are compensated as an occupational disease. In California, policemen and firefighters are automatically compensated for a heart attack, even if it occurs when not working. 3
4 Burden of work-related problems Has always been underestimated because official statistics are based on data from compensation or surveillance schemes. Such information underestimates the role of work in diseases of multifactorial etiology, e.g, lung cancer due to the combined exposure to a work-related causal risk factor and active smoking, acting synergistically. 4
5 Coaction of asbestos exposure and tobacco smoking on the incidence of lung cancer (Kjuus et al., 1986) Causal risk factor Attributable fraction Preventive fraction Asbestos 1 % 23 % Asbestos + Smoking 22 % 83 % Smoking 61 % Total >100% 5
6 Occupational burden of disease "UN agency [ILO] calls for more investic ation into work-related deaths" THE LANCET May, 2002 An accurate estimate of the work-related burden of disease requires solid scientific studies or well-planned surveys. Such studies have have recently carried out in the Australia, Finland, New Zealand, USA, and on a regional and global basis. 6
7 References Murray CJL, Lopez AD. Global mortality, disability, and the contribution of risk factors: global burden of disease study. Lancet 1997;349: Leigh JP, Markowitz SB, Fahs M, Shin C, Landrigan PJ. Occupational injury and illness in the United States. Estimates of costs, morbidity, and mortality. Arch Intern Med 1997;157: Morrell S, Kerr C, Driscoll T, Taylor R, Salkeld G, Corbett S. Best estimate of the magnitude of mortality due to occupational exposure to hazardous substances. Occup Environ Med 1998;55: Leigh J, Macaskill P, Kuosma E, Mandryk J. Global burden of disease and injury due to occupational factors. Epidemiology 1999;10: Ezzati M, Lopez AD, Rodgers A, Vander Hoorn S, Murray CJL, and the Comparative Assessment Collaborating Group. Selected major risk factors and global and regional burden of disease. The Lancet 2002 November 2;360(9343):
8 The Finnish Study The aim of this study was: (1) to estimate the work-related mortality in Finland for specific diseases; (2) to consider methodologic issues and uncertainties of the estimation The results were published in the Scandinavian Journal of Work Environment and Health (2001) Poster at the annual conference of the Australian Epidemiological Association in Sydney in September
9 Direct method of computation Computation based on the Finnish Register of Occupational Diseases is problematic because: the Register does not cover completely all incident cases of disease the Register does not provide separate statistics on fatalities preparing statistics about occupational diseases involves issues that depend on an agreement 9
10 Indirect method of estimation In the estimation, we used the following souces of information: epidemiologic research data on the magnitude of the risk of work-related diseases cause of death statistics for males and females in Finland for 1996 The Finnish job-exposure matrix of the prevalence and level of exposure to chemical agents and stress factors 10
11 An example of the description of agents in Finnish job-exposure matrix Domain: Chemical agents Name: Polycyclic aromatic hydrocarbons (PAHs) Definition of unit: µg/m 3, microgram of all PAH compounds in cubic meter of workroom air Definition of exposure: Occupational, inhalatory exposure to particulate or volatile PAH compounds including 2-ring PAHs (naphthalene), 3-ring PAHs (phenanthrene, anthracene, carbazole, fluorene), and 4- n -ring PAHs (e.g., pyrene, benzo(a)pyrene, chrysene, benzo(ghi)perylene) Assessment threshold: Possibly at least 5% of the occupation exposed to an annual mean level of 0.1 µg/m 3 of the agent at any time in
12 Lowest mean value: 0.05 µg/m 3 Highest mean value: 70.0 µg/m 3 Remarks: Nonoccupational annual mean exposure originating from indoor emissions (tobacco smoke, fireplaces) and ambient air (traffic, combustion processes) does not usually exceed 0.1 µg/m 3 Percent of T ime workers Level of Occupation period exposed exposure Met al smelting furnacemen Welders and flame cutters Cookers and furnacemen (chemical processes) Total number exposed workers in (percentage of the 1970 population): Men (6.6%); Women 1773 (0.2%) 12
13 The basic estimation approach Risk ratio (RR) estimates for specific exposure-disease associations were identified from epidemiologic stu dies (340 references). When the RRs were based on disease incidence studies, an assumption was made that the incidence rate ratio was comparable to the corresponding mortality risk ratio. 13
14 The proportion of people exposed to an occupational risk factor were obtained from census data on occupation and branch of industry with the aid of a Finnish job-exposure matrix. The RRs and exposure proportions were then used to calculate the attributable fractions (AFs) of deaths. Finally, the AF s were applied to the cause-, age-, and sex-specific mortality statistics of Finland for 1996 to obtain estimates of the number and proportion of work-related fatalities. 14
15 Criteria for selection of studies Epidemiologic studies conducted in - Finland and Scandinavia - western Europe and - North America - other countries with a reasonably similar industrial development as in Finland High methodologic quality with regard to - accurate assessment of exposure - precise diagnosis of disease according to the international classification - important confounding factors reasonably well under control Causality of the exposure-disease association assessed mainly by 15
16 - the specificity of the association - the strength of the association, including the presence of a dose-response relation - the consistency of the result with summary results from reviews and metaanalyses - analogy to a previously proven causal relation 16
17 Comparability of exposure information To ensure comparability of level of exposure in the source population providing the risk ratio (RR) estimate and in the Finnish target population we chose: cohort studies representing exposure levels similar to those prevalent in the particular target populations to which the RR estimates were applied case-referent studies whose reference subjects were drawn by representative sampling of the source populations from which the cases were derived record-linkage studies based on national data on mortality risk or disease incidence, 17
18 population census statistics on job-title or branch of industry, and job-exposure information defining the level of exposure in a specific job or industry 18
19 The concept of attributable fraction The population attributable fraction (AF) is the proportion of the total burden of a disease that is related to a given risk factor in a population. The AF parameter may be interpreted as that fraction of the disease which would not have occurred had the factor been nonexistent in the population. 19
20 AF formulas Cohort data: P(RR-1)/[P(RR-1) + 1] RR = risk ratio for the exposed P = proportion exposed in the cohort Unbiased estimate adjusted for confounding: P c (RR a -1)/RR a RR a = adjusted risk ratio P c = exposure prevalence among cases Case-referent data: P c (OR a -1)/OR a OR a = adjusted odds ratio 20
21 Risk Assessment Magnitude of risk & Prevalence of exposure Attributable fraction of work-related deaths (AF %) Total no. of deaths AF % = No. of work-related deaths 21
22 Uncertainty of estimation Lung cancer cases N = 113 (Helsinki area) RR = 2.3 (95 % confidence interval ) Risk reduction: Asbestos exposure 35 % 25 % 15 % Attributable fraction 19 % 14 % 8 % (Karjalainen et al., 1994) 22
23 Attributable fraction estimates Attributable fraction of all deaths Attributable fraction of 'relevant' deaths* Estimated number of work-related deaths Men 6.4 % 10.2 % Women 1.0 % 2.1 % 250 Total 3.7 % 6.7 % * Includes deaths in the relevant disease and age categories 23
24 Estimated number of fatalities Work-related deaths Cause of death Total no. of deaths* AF % Estim. no (%) Malignant neoplasms (46) Diseases of the circulatory system (31) Disease of the respiratory system (9) Mental disorders (5) Diseases of the nervous system (2) Diseases of the digestive system (<1) Diseases of the genitourinary system (<1) Infectious diseases (0) Accidents and (5) violence All avovementioned causes
25 Occupational exposures and male lung cancer mortality Exposure AF % Estim. no Asbestos and its interaction with smoking Radon progeny 4.5 Environmental tobacco 3.0 smoke Quartz 2.7 Diesel exhaust 2.5 Chromium (hexavalent) 1.6 Nickel sulfate 1.5 Lead 1.4 Arsenic and smoking 0.9 Welding fumes 0.5 (mild steel) Cadmium 0.2 Total
26 Passive smoking kills Drawing Juha Juvonen Design Agency Kaipuu 26
27 Deaths caused by environmental tobacco smoke at work Cause of death AF % Estimated no. Lung cancer Chronic obstructive pulmonary disease Astma Pneumococcal infection Ischemic heart disease Stroke All causes of death Men Women Total
28 Sensitivity analysis Attributable fraction Age range, years for shift work Unreduced ischemic heart disease risk after retirement Observed: 10% % % Reduced ischemic heart disease risk after retirement a Observed: 10% % % a Risk reduced by 25%, 50%, and 75% in the age classes of 60-64, 65-69, and years. Preferred AR = 17 % based on years. 28
29 International comparison of AFs Attributable fraction % Cause of death Finland a USA b Australia c Malignant neoplasms Circulatory diseases Chronic obstructive pulmonary disease Diseases of the nervous system Renal diseases Estimates: a This study b Leigh JP et al., 1997, 2000 c Morrell S et al., 1998 (only exposure to chemical substances) 29
30 The size of the problem work-related fatalities per annum (employed work force 2.1 million) Debating whether the actual number of workrelated deaths in Finland due to hazardous substances or environments is nearly 2000, or only 1000 is missing the point, unless one truly feels that those 1000 deaths annually are acceptable. 30
31 Perspective A comparison with other deaths in 1996, a part of which could possibly have been prevented by removing the causal factor: suicide diabetes 593 traffic and transportation accident 408 poisonings due to abuse of alcohol
32 Medical costs by disease in the USA Disease _ Cost, billion US$ Circulatory 142 Cancer 59 Diabetes 46 Pulmonary 19 Occupational diseases 14* HIV 10 Arthritis 7 Asthma 6 Epilepsy 2_ * Based on the AF estimates of the Finnish study 32
33 Global Burden of Disease Study The Comparative Risk Assessment Collaborating Group has recently (The Lancet, Nov 2002) estimated for the WHO's World Health Report 2002 the occupational burden of mortality from: risk factors for injuries carcinogens airborne particulates Total of deaths. Excluded are, e.g., risk factors for circulatory diseases Revised estimate 1.3 billion deaths. circulatory system Diseases of the circulatory system 33
34 Caution for invalid extrapolation ILO (Takala, 1999) used the Australian rate of fatal occupational injuries (diseases and accidents) in 1996, i.e per as the basis for estimating the global occupational burden: deaths. This linear extrapolation is problematic because it is targeted at a highly heterogeneous world population. Countries have different standards of occupational health which strongly influence the injury rates. 34
35 Cf. the Finnish rate of 7.2 per Applying this rate to the Australian population would result in a gross (1/5) underestimation, and even worse results if it were applied to populations of world regions in developing economies. Yet WHO (Leigh et al., 1999) applied quite arbitrarily twice the Finnish rates for occupational diseases and twice the Australian rates for accidents for estimating the occupational injury burden in developing countries. 35
36 Concerns for risk reduction The ILO has noted that developing countries have shifted much of their burden of work-related problems to developing countries where labor is not only cheaper but less also protected. E.g., there is practically no coal mining any more in the EU countries and electronic products are assembled in developing countries. However, the design and control of operations is kept in industrialized countries. 36
37 Conclusions High-quality epidemiologic studies and survey data are essential for obtaining reliable estimates of the proportion of deaths due to occupational factors. Work-related mortality is significant part of the total mortality in Finland and worldwide that is due to preventable risk factors. Circulatory diseases and other diseases caused by exposure to agents other than asbestos is according to the Finnish study greater than what has been presumed. 37
38 Thank you
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